<template>
	<div class="sc-upload-file">
		<el-upload
			v-model:file-list="defaultFileList"
			:disabled="disabled"
			:auto-upload="autoUpload"
			:action="action"
			:name="name"
			:data="data"
			:http-request="request"
			:show-file-list="showFileList"
			:drag="drag"
			:accept="accept"
			:multiple="multiple"
			:limit="limit"
			:before-upload="before"
			:on-success="success"
			:on-error="error"
			:on-preview="handlePreview"
			:on-exceed="handleExceed"
		>
			<slot>
				<el-button type="primary" :disabled="disabled">Click to upload</el-button>
			</slot>
			<template #tip>
				<div v-if="tip" class="el-upload__tip">{{ tip }}</div>
			</template>
		</el-upload>
		<span style="display: none !important"><el-input v-model="value"></el-input></span>
	</div>
</template>

<script>
import config from '@/config/upload'

export default {
	props: {
		modelValue: { type: [String, Array], default: '' },
		tip: { type: String, default: '' },
		action: { type: String, default: '' },
		apiObj: { type: Object, default: () => {} },
		name: { type: String, default: config.filename },
		data: { type: Object, default: () => {} },
		accept: { type: String, default: '' },
		maxSize: { type: Number, default: config.maxSizeFile },
		limit: { type: Number, default: 0 },
		autoUpload: { type: Boolean, default: true },
		showFileList: { type: Boolean, default: true },
		drag: { type: Boolean, default: false },
		multiple: { type: Boolean, default: true },
		disabled: { type: Boolean, default: false },
		onSuccess: {
			type: Function,
			default: () => {
				return true
			}
		}
	},
	data() {
		return {
			value: '',
			defaultFileList: []
		}
	},
	watch: {
		modelValue(val) {
			if (Array.isArray(val)) {
				if (JSON.stringify(val) !== JSON.stringify(this.formatArr(this.defaultFileList))) {
					this.defaultFileList = val
					this.value = val
				}
			} else {
				if (val !== this.toStr(this.defaultFileList)) {
					this.defaultFileList = this.toArr(val)
					this.value = val
				}
			}
		},
		defaultFileList: {
			handler(val) {
				this.$emit('update:modelValue', Array.isArray(this.modelValue) ? this.formatArr(val) : this.toStr(val))
				this.value = this.toStr(val)
			},
			deep: true
		}
	},
	mounted() {
		this.defaultFileList = Array.isArray(this.modelValue) ? this.modelValue : this.toArr(this.modelValue)
		this.value = this.modelValue
	},
	methods: {
		//默认值转换为数组
		toArr(str) {
			var _arr = []
			var arr = str.split(',')
			arr.forEach((item) => {
				if (item) {
					var urlArr = item.split('/')
					var fileName = urlArr[urlArr.length - 1]
					_arr.push({
						name: fileName,
						url: item
					})
				}
			})
			return _arr
		},
		//数组转换为原始值
		toStr(arr) {
			return arr.map((v) => v.url).join(',')
		},
		//格式化数组值
		formatArr(arr) {
			var _arr = []
			arr.forEach((item) => {
				if (item) {
					_arr.push({
						name: item.name,
						url: item.url
					})
				}
			})
			return _arr
		},
		before(file) {
			const maxSize = file.size / 1024 / 1024 < this.maxSize
			if (!maxSize) {
				this.$message.warning(`上传文件大小不能超过 ${this.maxSize}MB!`)
				return false
			}
		},
		success(res, file) {
			var os = this.onSuccess(res, file)
			if (os !== undefined && os === false) {
				return false
			}
			var response = config.parseData(res)
			file.name = response.fileName
			file.url = response.src
		},
		error(err) {
			this.$notify.error({
				title: '上传文件未成功',
				message: err
			})
		},
		beforeRemove(uploadFile) {
			return this.$confirm(`是否移除 ${uploadFile.name} ?`, '提示', {
				type: 'warning'
			})
				.then(() => {
					return true
				})
				.catch(() => {
					return false
				})
		},
		handleExceed() {
			this.$message.warning(`当前设置最多上传 ${this.limit} 个文件，请移除后上传!`)
		},
		handlePreview(uploadFile) {
			window.open(uploadFile.url)
		},
		request(param) {
			var apiObj = config.apiObjFile
			if (this.apiObj) {
				apiObj = this.apiObj
			}
			const data = new FormData()
			data.append(param.filename, param.file)
			for (const key in param.data) {
				data.append(key, param.data[key])
			}
			apiObj
				.post(data, {
					onUploadProgress: (e) => {
						const complete = parseInt(((e.loaded / e.total) * 100) | 0, 10)
						param.onProgress({ percent: complete })
					}
				})
				.then((res) => {
					var response = config.parseData(res)
					if (response.code === config.successCode) {
						param.onSuccess(res)
					} else {
						param.onError(response.msg || '未知错误')
					}
				})
				.catch((err) => {
					param.onError(err)
				})
		}
	}
}
</script>

<style scoped>
.el-form-item.is-error .sc-upload-file:deep(.el-upload-dragger) {
	border-color: var(--el-color-danger);
}
.sc-upload-file {
	width: 100%;
}
.sc-upload-file:deep(.el-upload-list__item) {
	transition: none !important;
}
</style>
